My wife wants to buy me a wort chiller for my birthday. I have no clue about wort chillers. If I go to my local homebrew store they sell them for about $120. I've looked at them on various websites; ebay, northern brewer, amazon, etc. Some are in the low $40 while others that appear identical are more expensive. Most of them are 3/8" tubing x 25 feet long tubing. Why such a drastic differenence in price? I'm a firm believer in you get what you pay for, but copper tubing is copper tubing, right? Is stainless better than copper? Any help would be greatly appreciated. 
